/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.runtime.arrow.writers;

import org.apache.flink.annotation.Internal;
import org.apache.flink.table.dataformat.GenericRow;
import org.apache.flink.table.dataformat.TypeGetterSetters;

import org.apache.arrow.vector.complex.StructVector;

/**
 * {@link ArrowFieldWriter} for Row.
 */
@Internal
public final class RowWriter<T extends TypeGetterSetters> extends ArrowFieldWriter<T> {

	private final ArrowFieldWriter<TypeGetterSetters>[] fieldsWriters;
	private final GenericRow nullRow;

	public RowWriter(StructVector structVector, ArrowFieldWriter<TypeGetterSetters>[] fieldsWriters) {
		super(structVector);
		this.fieldsWriters = fieldsWriters;
		this.nullRow = new GenericRow(fieldsWriters.length);
	}

	@Override
	public void doWrite(T value, int ordinal) {
		TypeGetterSetters row;
		if (value.isNullAt(ordinal)) {
			row = nullRow;
			((StructVector) getValueVector()).setNull(getCount());
		} else {
			row = value.getRow(ordinal, fieldsWriters.length);
			((StructVector) getValueVector()).setIndexDefined(getCount());
		}
		for (int i = 0; i < fieldsWriters.length; i++) {
			fieldsWriters[i].write(row, i);
		}
	}

	@Override
	public void finish() {
		super.finish();
		for (ArrowFieldWriter<?> fieldsWriter : fieldsWriters) {
			fieldsWriter.finish();
		}
	}

	@Override
	public void reset() {
		super.reset();
		for (ArrowFieldWriter<?> fieldsWriter : fieldsWriters) {
			fieldsWriter.reset();
		}
	}
}
